Mine's at least that long. Just try to keep the pipe so it doesn't have bellies so stuff can accumulate. The pumping action should keep them clean, but better safe than sorry and it can keep smells down if the thing isn't used often.

If it has an air gap, then, by definition, all the water in the hose above the bottom of the dishwasher will drain back into it, if the pump's check valve does not hold which few of them do. That being the case, it might be better to keep the hose low, i.e., below the cabinet's floor, until it gets to the sink cabinet to minimize the amount of water subject to that backflow.

If it has an air gap, then, by definition, all the water in the hose above the bottom of the dishwasher will drain back into it, if the pump's check valve does not hold which few of them do. That being the case, it might be better to keep the hose low, i.e., below the cabinet's floor, until it gets to the sink cabinet to minimize the amount of water subject to that backflow.

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So would you be suggesting a high loop at the dishwasher then carry the distance near the floor? That way the only water able to return to the dishwasher would from the peak of the loop.

Unless your dishwasher is a lot more expensive than mine, you might want the wall there for acoustic reasons. Make it a 6-inch wall, stuffed with fiberglass, open on the DW side to suck up the noise.

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I am hoping that this $700 Maytag will be quieter than the $100 off brand I have in my current home, which I do not find to be all that noisy.

I was only considering the half wall to provide a place for me to give the dishwasher it's own drain. I suppose I will just build the half wall as the back of the peninsula. Better support for the granite I guess.